COM Discussion Boards

Help with COM+ LCE subscriber problem for own event class

GraemeChambers3-Dec-08 22:08

3-Dec-08 22:08

I have created my own event class, publisher, and subscribers in C# .NET The event class and subscriber definitions exist in the same library. The publisher is a stand alone app which references this library. The subscriber is a windows service which also references this library.

In the windows service subscriber, I am able to receive normal COM+ events such as ApplicationEvents, ActivityEvents, etc etc, but I am having trouble receiving events from my own event class.

I am getting the exception: System.Runtime.InteropServces.COMException(0x80040201): An event was unable to invoke any of the subscribers.

My subscription code is:
ICatalogObject subscription = (ICatalogObject)transients.Add();
subscription.set_Value("Name", this.ToString()); // name it
subscription.set_Value("EventCLSID", GetEventClassID());
subscription.set_Value("InterfaceID", GetEventInterfaceID());
subscription.set_Value("SubscriberInterface", GetIUnknown());
bool success = transients.SaveChanges() == 0;

I have registered the library containing the event class with gacutil and regsvcs etc, but I can't receive events. The publisher application is listed in the Component Services viewer aswell -- it shows that the publisher app is using my event class.

Can anyone help me? I'm stuck

Composite active X control using VC++ 6.0

Nikkiee3-Dec-08 10:45

Nikkiee

3-Dec-08 10:45

Hi Helper,

can you please. le mw know.
Is is really possible to make the ATL COM component embedding the active x (.ocx) inside it.
If yes can you please provide me the steps to do so.

I have an assignment . to make the ATL COM component with embedding the .ocx.
Here is the brief of the requirement.

I am having on e.ocx provideed by the vendor say as scanner.ocx.
What is need to do is make one another ATL COM or active x using this .ocx file. This componet which I am creating also support one dialog and should be all the controls( like buttons combo, I mean all the user interface,)

How to do that.
we need to make ATL COM or use the active x wizard for that.
can you please let me know the steps do so. It's urgent.

Thanks,

Can I use GetActiveObject() in Server application ?

Zyraph2-Dec-08 21:56

Zyraph

2-Dec-08 21:56

I create C# console application that use outlook to open msg file.
The application work well on server when I use remote desktop.

But when I try to run the console application from ASP.NET page. GetActiveObject() cannot find outlook instance.

What should I adjust/setting something to make the application work ?
Is it possible to GetActiveObject() in this situation ?

Passing an interface pointer to a component

Taruni1-Dec-08 0:54

Taruni

1-Dec-08 0:54

Hi,

I have a vc++ application that has an interface IMyInterface and a class derived from this interface.I would like to pass a pointer to this interface, to an interface method declared in a component. I am trying to manually edit the header files and .idl file in order to declare the pointer to the interface declared in vc++ application.

What I did is, I have included the vc++ app interface header file in the .idl file. I don't whether I can do this or not. But I am trying...When I did so, I am getting error "error MIDL2025 : syntax error : expecting a type specification near "virtual".

Please let me know as how to pass my interface pointer to a method in the component and what are the changes that are to be made.

Thanks in advance.

Taruni

Re: Passing an interface pointer to a component

Jonathan Davies18-Dec-08 2:50

Jonathan Davies

18-Dec-08 2:50

You can #include a .h file in MIDL to add structs etc, but in your case I think you need to #include the .idl file with the definition of the interface you want to pass e.g.

#include "IMyInterface.idl"

usually this is after the

#import oaidl.idl
#import ocidl.idl

Your interface should then have a method (or similar):

HRESULT PassMyInterface([in] IMyInterface* pIMyInterface);

How to create a MimeFilter?

svt gdwl30-Nov-08 20:33

svt gdwl

30-Nov-08 20:33

Hi,
I'm using visualstudio6.0 and new to the COM. I want to create a mime filter such that i can able to retrieve the web page content and replace it with other data. Please, help me.

How I have to start creating a plug-in?

I have gone through this link (i.e., http://msdn.microsoft.com/en-us/library/aa767916(VS.85).aspx), but unable to understand it clearly.

Thanks in Advance...

Help needed in COM development

mahammadhusen28-Nov-08 2:36

mahammadhusen

28-Nov-08 2:36

Hi Can anyone here tell me how can i implement these Interface in C#,I am creating an com component and i need to impliment these.

IPersistProperty
IPersistPropertyBag

Pleas help me u can also give any article regarding this.

thank you

Mahammadhusen

Creating COM, DCOM in VB 6.0

indian14325-Nov-08 19:13

indian143

25-Nov-08 19:13

Hi,
Can anybody provide me links for how to create and deploy COM, DCOM in remote servers and accessing them using VB code located in remote server.

I would be very much thankfull to all of who tried to support me in anyway.

If links explain with sample codes, it will be very much helpfull.

Thanks a Lot,
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

Passing a Function Pointer to a function in IDL : Need Solution Urgently

ShyamR23-Nov-08 22:50

ShyamR

23-Nov-08 22:50

Hello everybody,

I have an issue while working with COM Out-Of-Proc Servers.
My situation is such that, the client need to pass a Function pointer
to the Server, so that the server can fire callbacks at regular intervals.
So I need to define one of opearions in the interface provided by the Server to
take one function pointer.

Now the problem is that while doing so in IDL file, MIDL doesn't allow me and throwing errors.

Please help me guys...

Thanks in Advance..
Shyam

Re: Passing a Function Pointer to a function in IDL : Need Solution Urgently

merina200515-Dec-08 0:05

merina2005

15-Dec-08 0:05

I think you can use connection points to fire the reply back to the client. The event sink at the client side can hold the function pointer. When the fired reply reaches the event sink of connection points you can re-direct it to the corresponding function.

Re: Passing a Function Pointer to a function in IDL : Need Solution Urgently

Jonathan Davies17-Dec-08 1:19

Jonathan Davies

17-Dec-08 1:19

ConnectionPoints are one method. What MIDL will allow is to pass an interface pointer tather than a finction pointer. Then you can call a function of that passed interface from the server.
Have the client implement an interface with the callback function and the server an interface with a method that takes a pointer to the first interface as a parameter. Then in the client internally QueryInterface for the interface and pass it to the server.

Re: Passing a Function Pointer to a function in IDL : Need Solution Urgently

ShyamR17-Dec-08 2:20

ShyamR

17-Dec-08 2:20

Thanks Jonathan for your reply...
That really eased my problem..

How to use DLLImport when the entry point is nested in a class?

cor287921-Nov-08 5:42

cor2879

21-Nov-08 5:42

Hi, I have searched around the web and all my reference books but have yet to see an example of how this is done, or even if it can be done.

Here is my dilemma:

I have some old legacy apps that were written in VB6. Yay. Despite the fact that the VB6 programmers never used Object Oriented Programming of any kind... for some reason in this case they decided to nest the Procedure I need inside a class. Because of some poor programming practices that our team insists on following, I am prohibited from creating a strong reference to this COM Dll, I have to use PInvoke. So How can I use PInvoke to reference a method when it is a member of a VB6 class? The entry point is not recognized since an instance of the class would need to first be instantiated in order to access the method. Here is a sample of what my DllImport looks like:

[DllImport("SomeCOMDll", EntryPoint="aVB6Function")]
    public static extern Recordset AVb6Function([MarshalAs(UnmanagedType.BStr)]
                                            string globalIdentifier,
                                            [MarshalAs(UnmanagedType.BStr)]
                                            string webUser_ID,
                                            DateTime shipDate,
                                            [MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_BSTR)]
                                            string[,] origDestArray,
                                            [MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_BSTR)]
                                            string[,] wtClsArray,
                                            [MarshalAs(UnmanagedType.BStr)]
                                            string mode,
                                            [MarshalAs(UnmanagedType.BStr)]
                                            string svcLvl,
                                            [MarshalAs(UnmanagedType.BStr)]
                                            string IOT,
                                            [MarshalAs(UnmanagedType.BStr)]
                                            string custCode,
                                            [MarshalAs(UnmanagedType.Currency)]
                                            decimal fuel,
                                            [MarshalAs(UnmanagedType.Currency)]
                                            decimal addtMarkupPct,
                                            [MarshalAs(UnmanagedType.SafeArray, SafeArraySubType = VarEnum.VT_BSTR)]
                                            string[,] webAccChgArray);

"We are men of action; lies do not become us."

Recieving events when client is waiting

merina200520-Nov-08 23:22

merina2005

20-Nov-08 23:22

I am using VisualStudio6 and fairly new to COM.

I am using connection points for recieving reply from a server. The issue is client is waiting for the reply. Since, event are like windows messages, the client will not recieve the events fired from server if
dwReturn = ::WaitForSingleObject( m_hSynEvent , INFINITE );
is called . Please provide a solution for recieving the events.
Thanking You in advance.

Re: Recieving events when client is waiting

Lim Bio Liong23-Nov-08 18:15

Lim Bio Liong

23-Nov-08 18:15

Hello merina2005,

You can use ATLWaitWithMessageLoop(). However, there is a design flaw with this function : there is no timeout parameter.

I have written a function that waits for an event that also times out when required. Email me if you want it. My email address is :

bio_lim_2004@yahoo.com

Best Regards,
Bio.

Re: Recieving events when client is waiting

merina200523-Nov-08 18:51

merina2005

23-Nov-08 18:51

Hi;

ATLWaitWithMessageLoop() allows other window messages to be dispatched while waiting. I want my GUI to wait(ie, not to process any windows message)until the reply is obtained. Do Help.
Thanking You in advance.

Re: Recieving events when client is waiting

Lim Bio Liong24-Nov-08 0:41

Lim Bio Liong

24-Nov-08 0:41

>> I want my GUI to wait(ie, not to process any windows message)until the reply is obtained...

This is v strange. If your GUI does not receive any windows messages, then it will be totally fixed on the screen and immobile. It will not receive any WM_PAINT messages and so covering it and then uncovering it will not cause it to repaint its client area. It will not even respond to any mouse click and drag.

But if this is really what you want then you should go ahead and use WaitForSingleObject(). The effect will be as you desired.

But I must be missing out on something here. Maybe you have not explained yourself fully.

- Bio.

Re: Recieving events when client is waiting

merina20052-Dec-08 21:11

merina2005

2-Dec-08 21:11

In the case od STA application, the event fired using connection point will not be recieved if we use WaitForSingleObject(). I have fixed this issue by using CoWaitForMultipleHandles(). In this case, pending events are processed after obtaining the reply from connection points.
Thank You for your updates.

Add MS Excel Application to DCOM Config

P.T.R.K19-Nov-08 22:38

P.T.R.K

19-Nov-08 22:38

Hi,

I have a server which is used for windows 2000 advanced server. This server i have created a asp.net application to read excel sheet and update the data into the database.

I want to add permission for ASPNET for MS Excel Application. But it does not listed on DCOM Config properties.

How can i add/migrate MS Excel Application to DCOM Config properties?

It is urgent to update for my project.

Thanks in advance

Re: Add MS Excel Application to DCOM Config

jabdal22-Dec-08 7:39

jabdal

22-Dec-08 7:39

It's under there. Add ASPNET to local launch and activate permissions. With Excel 2007, I found it necessary to login as ASPNET user using a program called anup(gets ASP.NET encypted password), logging in as ASPNET user, and then clicking OK on dialogs which popped up in order for interop automation to work from ASPNET user account.

Re: Add MS Excel Application to DCOM Config

rama charan9-Oct-11 22:58

rama charan

9-Oct-11 22:58

download the anup here http://www.nirsoft.net/utils/anup.html[^

Rama Charan Prasad

"Be happy and Keep smiling... Smile | :)

ActiveX loose focus

AnTri19-Nov-08 10:46

AnTri

19-Nov-08 10:46

Hey,

i've written a ActiveX-control using MFC. The control creates a CWnd which hosts a CListCtrl. All works fine, in Ms Testcontainer but not e.g. in Ms Access/Excel. When I use a form in Access and place my control on the form, no key events reach my control (even if the control has focus). All mouse-events works well. How can I send the keystrockes to my control (eg. move cursor on my listctrl)?

Thank you for helping me...

IFolderViewOC reference from within Windows Explorer

__DanC__19-Nov-08 2:11

__DanC__

19-Nov-08 2:11

Does anyone know how to get a reference to the IFolderViewOC interface from within an Explorer extension (sidebar)?

I am trying to get a reference from with IObjectWithSite::SetSite(), I have tried using the IServiceProvider which fails and I now think I need to query a service to get the reference but do not know which service to query.

Does anyone have any ideas?

working with com dll resources

Taruni18-Nov-08 18:26

Taruni

18-Nov-08 18:26

Hi,

I am working with COM dll resources. I have created a menu in a com dll and provided an interface with a method to return the handle to the menu.
When I am trying to pass this handle(converting to int) to CSingleDocTemplate of InitInstance() and trying to run the application, I am getting "Failed to create empty document".

My intention is to use the menu(resource) which is present in the com dll in my application.

In order to achieve this, is this the correct way of proceeding or not? If yes, where am I doing wrong?
If not, please suggest an alternative mechanism.

Thanks in advance.

Taruni

Configure DCOM component on my computer [modified]

indian14318-Nov-08 3:56

indian143

18-Nov-08 3:56

Hi,

I have one ASP application which is using a DCOM component, I have to configure that DCOM component on a Server with Win 2003 operating system.

Can anybody please give me some hints or links to do this task.

Ultimately now I have registered it but it is giving the error and a warning as below in the Event Log, please help me in resolving this issue.

The description for Event ID ( 36512 ) in Source ( SEIPMAFILEDOWNLOAD ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: <ERRORCALLSTACK><ERROR><NUMBER>-2147184992</NUMBER><DESCRIPTION>0-</DESCRIPTION><COMPONENT>seipma_comFileDownload</COMPONENT><MODULE>pzFileDownload</MODULE><ROUTINE>FileDownload</ROUTINE><EIID>11/17/08-21:37-705</EIID><ADDINFO><EXECUTION_STEP>Getting download data: file name = Download11172008.exe</EXECUTION_STEP><PROCEDURE_PARAMETERS><APPSECDB><![CDATA[<ADO_APP_SEC_DB><DSN>SW_APPSECDB_0370a</DSN><USERID>SW0370</USERID><PASSWORD>zaq12wsx</PASSWORD><GUID>{6C067960-45E4-11D3-9F43-00A0D1063EC9}</GUID></ADO_APP_SEC_DB>]]></APPSECDB><USER_SID><![CDATA[{96FBC159-D12A-11D4-8E69-0008C72B623C}]]></USER_SID><FILENAME><![CDATA[Download11172008.exe]]></FILENAME></PROCEDURE_PARAMETERS></ADDINFO><ERRORLOGGED>

And a warning as below

The average call duration has exceeded 10 minutes. If this is not the expected behavior, please see article 910904 in the Microsoft Knowledge Base at http://support.microsoft.com for details on how to use the COM+ AutoDump feature to automatically generate dump files and/or terminate the process if the problem occurs again.
Server Application ID: {4C8DA47F-4AC2-4250-AFB3-0115E933175F}
Server Application Instance ID:
{65909717-9B34-44DA-8A88-127AB60FFE09}
Server Application Name: PMABLayer

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Thanks a Lot,
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

modified on Tuesday, November 18, 2008 11:15 AM

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